DESCRIPTION OF PLATE 27. 



Lonsdaleia chinensis Girty (p. 311). 



1. Transverse section showing the general structural characters. The fairly constant shape and size 



of the inner portion of the corallites, as compared with their variable shape and size where 

 taken as a whole, is worthy of notice. X 3. 



2. Longitudinal section, X 3. The corallite to the right is cut through its axis and shows well the three 



structural zones of which it is composed. Laterally, in a much broader band on one side than 

 on the other, are the zones of vesicular tissue, the cysts of various sizes and sloping obliqm-ly 

 downward. In the center is the pseudocolumella, made- up of small cysts strongly sloping 

 downward in both directions from the center. Medially on either side of the pseudo-columella 

 is the tabulate zone crossed by closely arranged, more or less horizontal, somewhat irregular and 

 inosculating diaphragms. The two other corallites are cut through the outer vesicular zone. 



3. A weathered fragment, natural size. 



Pennsylvanian (Wu-shan limestone), near Ta-ning-hien (station 2). 



Carnegiea bassleri Girty (p. 313). 



4. Transverse section, X 6. 



5. Longitudinal section, X 6. 



Pennsylvanian (Wu-shan limestone), near Liang-ho-k'6u (station 7). 



330 



